I start off getting my leash (gromp) and going for blue, once I have blue ill go for red buff and then the chickens

AFTER THAT EITHER
-Gank mid for lvl 4
-With enough health go for the Krugs (rock monsters in the red buff area)

you should be ganking as much as possible you can melt most characters

The way you should be using your ability's is
Q&E at the same time and then e onto the person your attacking after their knocked up either use a chilling smite or if their low enough just kill them

late game you should either be jumping in their with your insane life steal and sustain or picking off low characters and overall helping your team with fights you counter squishy characters with ease as long as you dont get crazy cc'ed